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gh-86273: On macOS >= 10.12, use clock_gettime(CLOCK_MONOTONIC_RAW) for time.monotonic #134521

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gh-86273: On macOS >= 10.12, use clock_gettime(CLOCK_MONOTONIC_RAW) for time.monotonic #134521

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ce6f264
On macOS >= 10.12, use `clock_gettime(CLOCK_MONOTONIC_RAW)` for `time…
jhohm May 22, 2025
04f5bb4
Do not use roles for native function and constant.
jhohm May 22, 2025
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2 changes: 1 addition & 1 deletion Doc/library/time.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -295,7 +295,7 @@ Functions

* On Windows, call ``QueryPerformanceCounter()`` and
``QueryPerformanceFrequency()``.
* On macOS, call ``mach_absolute_time()`` and ``mach_timebase_info()``.
* On macOS, call ``clock_gettime(CLOCK_MONOTONIC_RAW)`` if available, otherwise call ``mach_absolute_time()`` and ``mach_timebase_info()``.
* On HP-UX, call ``gethrtime()``.
* Call ``clock_gettime(CLOCK_HIGHRES)`` if available.
* Otherwise, call ``clock_gettime(CLOCK_MONOTONIC)``.
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/macOS/2025-05-22-11-48-08.gh-issue-86273.n95ARS.rst
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@@ -0,0 +1,2 @@
On macOS >= 10.12, use ``clock_gettime(CLOCK_MONOTONIC_RAW)`` for
:func:`time.monotonic`. Patch by John Keith Hohm.
13 changes: 8 additions & 5 deletions Python/pytime.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@
# include <winsock2.h> // struct timeval
#endif

#if defined(__APPLE__)
#if defined(__APPLE__) && !defined(CLOCK_MONOTONIC_RAW)
# include <mach/mach_time.h> // mach_absolute_time(), mach_timebase_info()

#if defined(__APPLE__) && defined(__has_builtin)
Expand Down Expand Up @@ -933,7 +933,7 @@ py_get_system_clock(PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
struct timespec ts;
#endif

#if !defined(HAVE_CLOCK_GETTIME) || defined(__APPLE__)
#if !defined(HAVE_CLOCK_GETTIME) || (defined(__APPLE__) && !defined(CLOCK_MONOTONIC_RAW))
struct timeval tv;
#endif

Expand Down Expand Up @@ -1090,7 +1090,7 @@ py_get_win_perf_counter(PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
#endif // MS_WINDOWS


#ifdef __APPLE__
#if defined(__APPLE__) && !defined(CLOCK_MONOTONIC_RAW)
static PyStatus
py_mach_timebase_info(_PyTimeFraction *base)
{
Expand Down Expand Up @@ -1125,7 +1125,7 @@ _PyTime_Init(struct _Py_time_runtime_state *state)
{
#ifdef MS_WINDOWS
return py_win_perf_counter_frequency(&state->base);
#elif defined(__APPLE__)
#elif defined(__APPLE__) && !defined(CLOCK_MONOTONIC_RAW)
return py_mach_timebase_info(&state->base);
#else
return PyStatus_Ok();
Expand All @@ -1146,7 +1146,7 @@ py_get_monotonic_clock(PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
if (py_get_win_perf_counter(tp, info, raise_exc) < 0) {
return -1;
}
#elif defined(__APPLE__)
#elif defined(__APPLE__) && !defined(CLOCK_MONOTONIC_RAW)
if (info) {
info->implementation = "mach_absolute_time()";
info->resolution = _PyTimeFraction_Resolution(&_PyRuntime.time.base);
Expand Down Expand Up @@ -1185,6 +1185,9 @@ py_get_monotonic_clock(PyTime_t *tp, _Py_clock_info_t *info, int raise_exc)
#ifdef CLOCK_HIGHRES
const clockid_t clk_id = CLOCK_HIGHRES;
const char *implementation = "clock_gettime(CLOCK_HIGHRES)";
#elif defined(__APPLE__) && defined(CLOCK_MONOTONIC_RAW)
const clockid_t clk_id = CLOCK_MONOTONIC_RAW;
const char *implementation = "clock_gettime(CLOCK_MONOTONIC_RAW)";
#else
const clockid_t clk_id = CLOCK_MONOTONIC;
const char *implementation = "clock_gettime(CLOCK_MONOTONIC)";
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